Lock



Jan. 12 1926.`

N. B. HURD LOCK Filed March 18, 1925 2 sheets-Sheet 1 Jan. 12 1926. 1,569,227

PatentedA J an. 12, 1926.

UNITED STATES PATENT OFFICE.

NORMAN B. HURD, OF NEXV BRITAIN, CONNECTICUT,'ASSIGNOR TO THE AMERICAN HARDWARE CORPORATION, OF NEW BRITAIN,v CONNECTICUT, A CORPORATION F CONNECTICUT.

LOCK.

Application mea March 1s, 1925. serial No. 16,300.

TQ allv whom if may concern:

Be. it known that I, NORMAN B. HURD, citizen of the United States of America, residing at New Britain, Connecticut, have invented a new and useful Lock, of which the following is a specication.

bly invention relates to a lock and is par ticularly, though not exclusively, adapt-ed for use on the doors of hotel rooms, and for the pur ose of'illustration Vwill be dcscribed 1n t at connection. 1

It is often annoying to a hotel guest to have a maid lor other employee unlock the "nest room while the same is occupied. My ock contemplates'that when the door is locked 4from the inside by the guest the maids key, inserted from the outside of the d'oor, will not unlock the door. When it becomes necessary to vopen a room locked from the inside, entry may be effected by iiieans of a master key in the possession of the hotel management. When the door is in open position the lock is dogged so that the locking bolt or latch cannotbe unintentionally locked in projected position.

It is the principal object; to provide a lock which cannot be unintentionally locked while the door is open.

It is a more specific object to provide a lock with an auxiliary latch to dog the locking mechanism when the auxiliary latch is projected, as when the door carrying the lock is open. I

Other minor objects will be apparent as the speciication proceeds.

Briefly stated, in the preferred form of my invention the lock case is provided with 'a latch bolt and contemplates the use of a protected strike plate for preventing picking of the lock.A In the lock case lever mechanism is provided for moving` the latch to retracted position to permit the door to be opened. Then the door is closed and it is desired to'lock the same from the inside, key-controlled means are provided for throwing the latch' retracting mechanism into a positionsuch that it cannot be operated by uneans 'orf a inaids key inserted from the outside o f'the door. When it is tracting mechanism so as to lbe in position to be engaged by thevkey controlled means so that the latch may be retracted. Means, such as an auxiliary latch, is provided for clogging the locking mechanism when the door is open so that the main latch cannot be unintentionally locked in the projected position when the door is open.

In the drawings I have shown, for illustrative purposes only, a preferred form of the invention.

In said drawings- Fig. l is aside View of a lock with the cover removed and embodying features of my invention;

-Fig. 2 is a view similar to Fig. l, but showing the `latch locked;

Fig. 3 is an isometric view of parts shown in Fig. l, the parts being-relatively separated for the sake of illustration;

Fig. 4: is a sectional view taken substantially inthe plane of the line 1 -4 of Fig. l;

Fig.`5 is an end view of a cylinder lock for use in connection with my invention;

lig. l6 is a side view, partly in section, of the cylinder lock shown in Fig. 5, and

Fig. 7 `is a view similar to Fig. 5 but showing the parts in a different position.

In said drawings, l indicates av conventionalor usual type of lock casing, having the face plate 2 thereon, as usual. This lock contemplates the use of a protected strike plate to prevent picking` of the lock and, since such protected strike plates are well known in the art and form no part of the invention, no specific showing or dcscription thereof is necessary. 3 indicates the latch bolt which may be operated by means of the usual yoke el. and knob roll back 5 connected to a door knob on the iuside of the door. In this specific example it is preferred that only the inner knob shall be connected to the roll back 5, and an outer knob, if one be provided on the door, would serve merely the purpose of a handle and would not be operative to retract the latch 3, such retraction being accomplished from the outside solely by key-controlled means.

6 indicates in general a slide bolt, which is slidabl'y mounted in the lock casing and is guided by the spline 7 fitting into a suitable guide groove (not shown) in the slide bolt 6. The slide bolt may be provided with a slot 8 fitting over a stud 9 projecting from the lock casing. The slide bolt lis thus freely movable back and forth but is prevented from other movement. The slide bolt, in the specific form shown, has an abutment 10 at the lower end thereof, which engages the plate 11 on the latch bolt 3 when the slide bolt is in the locked position (Fig. 2), as will be hereinafter described. A tumbler 12 may be pivoted on a stud 1.3 secured to the slide bolt`6 and is pressed upwardly by means of a spring 14 secured thereto `and engaging a stop 15. The forward end of the tumbler has a projection 16 thereon, which is adapted to fit in a slot 17 near the rear end of the slide bolt. The tumbler is preferably gated, as by means of the projection 18, which engages a fence or stump 19 on the lock casing for holding the 'tumbler and consequently the slide bolt in either the retracted position, as shown in Fig. 1, or in the locked position, as shown in F ig.`2.

In order to prevent the door from being accidentally locked when the door is open, I may dog the slide bolt 6, as by means of an auxiliary latch 20, which may be pivoted at 21 to a lever 22, pivotally mounted at 23 in the lock casing and urged outwardly, as by means of a coil spring 24. r1`his auxiliary latch, in the form shown, has a projection 25 atthe rear end thereof, which, when the auxiliary latch is in extended position, as when the door is open, engages beneath a projection 26 on the tumbler, and thus positively prevents the tumbler frombeing moved downwardly so as to disengage the projection 18 from the fence or stump 1 9 until the auxiliary latch 2O is retracted, either manually or by its striking the strike plate when the door is closed.

The mechanism for moving the latch bolt 3 may be in the form of link mechanism, all carried by the slide bolt 6. In the foim i shown a lever 27 is pivoted on the stud 13 which carries the tumbler, and this lever is in turn adapted to 'engage a second lever 28l which is pivoted on a stud 29 on the slide bolt 6. T helower end of the lever 28 has a projecting linger 30 for engaging behind the plate 11, as shown'particularly in Figs. 1 and 2, forretracting the latch bolt.

Vindicates a lock cylinder on what we will term theoutside ofthe door lock casing, which cylinder is provided with a cylinder plug 86, -Suitable pin tumblers or the like are, of course, employed for locking the plug in position. Secured to the rear end of the plug, as by means of screws 37-37, is a roll back or operating cam 38 for a purpose to be described. The roll hack 38 is preferably slotted as at 39, and a plate 4G, carrying a button or auxiliary roll back 41, slides in the groove. A small coil spring 42 serves to urge the auxiliary roll back 41 into the inward position,'as`shown in Fig. 7. The ordinary key, for example, the guest key or maids key of lahotel is shorter than that shown in Fig. 6 and would, therefore, not extend inwardly far enough to raise the vplate 40 and with it the auxiliary roll back 41. Under normal conditions, therefore, the auxiliary roll back 41 would occupy the position substantially as shown in Fig. 7. 1t is only the long master key, as shown in Fig. 6, which will extend the button 41 to the position shown in Figs. 5 and 6. The ypurpose ofthis will be hereinafter described. On the inside of the door lock casing may be secured a second cylinder lock 45, having a plug of the usual type, which .plug carries a'roll back 46.

The operation of the lock is as follows:

Then the door` is closed the guest key is inserted from the outside in the lock, the parts being in the position shown in Fig. 1, that is, Vthe unlocked position, the key vmay be turned so as to cause the plugyand roll back 38 shown in dotted lines in Fig. 1 to strike the lever 27 and, upon further rotation of the roll back 3S in a counterclock wise direction as viewedv in Fig. 1, the lever 27 will move the lever 28, which latter in turn will act on'the plate 11 to retract the latch 3. The door may then be opened, since it is only the latch 3 which serves as a latch, the member 2O being merely what is termed an auxiliary latch but having in fact no latching function, se far as concerns holding the door closed.

The guest may now enter the room and when'the doorI is again closed the latch 3 will take into the strike plate, and the auxiliary latch 20 will be moved to retracted position,

so as to move the projection 25 out of the way of the projection 26 on the tumbler 12. The guest may then insert the guest key in the inner cylinderlock 45 and rotate the roll back 46 in a clockwise direction as viewed-in Fig. 1. This action first depresses the projection 16 on the tumbler, and further clockwise rotation causes the rollback 46 to engage the Side of the groove 17 in the slide bolt 6 and'move thelatter to the left as viewed in Fig. 1, until the roll back 46 strikes against any suitable stop, as shown at 50. When the roll back 46 has moved the parts from the position as shown in Fig. f1 tothe 'position as shown in Fig. 2,`theabutment 10 on the slide bolt 6 will have engaged behind 'the plate '11 on the latch bolt, and 'since the Leeaaav tumbler has again been raised by the spring lelso as to cause the projection 18 to lit in front of the fence or stump 19, both the slide bolt and consequently the latch bolt Will be positively held in the locked position shown in Fig. 2. lflihile in this position it will be obvious that the door knob on the inside cannot serve to retract the latch bolt,`and it is only when the parts are again moved back to the position indicated in Fig. 1 that the inner door knob may be used. It might here be Well to state that withk the specific-lock illustrated, from the inside,the latch must always be retracted by the inner live door knob, and thatA the inner key-controlled means does not serve of itself to retract the latch bolt, but merely to position the parts to permit such retraction by the inner live knob.

Now assume that the guest has locked the door from the inside so thatthe various parts will be in the positions shown in Fig. 2. It will be seen that the lever 27 is moved toward the left in Fig. 2. so as to be out of the path of movement of either of the roll backs on either the inner or the outerl cylinder plug. Therefore, it will be plain that, should a maid insert a maids key into the outer cylinder lock 35, the roll back Would be free to rotate idly and it could not strike the lever 27, and, since no other mechanism is provided for retracting the latch bolt other than the knob from the inside, the door could not be opened. l/Vhen the guest key or maids key is used it Will be obvious that. the auxiliary roll back 4.1 Will be substantially in the position shown inFig.,7.

Now if, at any time, it becomes necessary to enter a room which has been locked from the inside. a long special master key in the custody of someone in authority is inserted in the outside cylinder lock, and this long key raises the plate and consequently the auxiliary roll back 41, to the position substantially as shown in Figs. 2, 5 and 6. Now, upon rotation of the roll back 38 in a counterclockivise direction as viewed in Fig. 2, the auxiliary roll back l1 being extended will engage the top of the projection 16 on the tumbler and will depress the same so as to disengage the projection 18 from the stump 19, and further counterclockwise n'ioveinent will cause the roll back 41 to move the slide bolt 6 to the right as viewed in Fi 2, until it again reaches the position as shown in Fig. 1. Further rotation then, of the roll back 3S serves to cause the lever 27 to be (lepresed, as hereinbefore described. If the master key be now again Withdrawn, the lock will be in position (Fig. 1) to be opened, either by means of the inner knob, the guest key or the maids key.

It will be seen that with a lock as above described it Will be impossible for a maid to annoy a guest in the room by entering the same When the'door'is locked from the inside. It Will also be evident that in case of emergency a door locked from the inside may be entered With the aid of a long` master key, usually kept in the possession of someone in authority. It will also be seen that When the door is open it is impossible to move the slide bolt so as to lock the latch bolt in locked position unless the auxiliary latch 2O be moved inwardly. This is a desirable provision, for the reason that it sometimes happens that a person may nervously turn a key While the door is open, and with a lock of this sort the door could then not be closed if the latch bolt. Were held in locked position.

lVliile one form of the invention has been described in detail, I do not Wish to be limited to the form shown, as changes may be made Within the scope of the invention as defined in the appended claims.

I claim:

1. In a lock, a lock case, a latch carried by said case, means for locking said latch in projected position, tumbler means for locking said means in one position, and an auxiliary latch for clogging` said tumbler to prevent actuation of said means when the auxiliary latch is projected.

2. In a lock, a lock case', a latch, a slide bolt for locking said latch in one position. a tumbler for locking said slide bolt, and an auxiliary latch for (logging said tumbler to prevent actuation While the auxiliary latch is projected.

3. In a lock, a lock case, a slide bolt. a tumbler on said slide bolt for locking the same in projected and retracted positions, and an auxiliary latch for y automatically clogging said tumbler to prevent actuation thereof when the auxiliary latch is projected.

4. In a lock, a lock case, a tumbler therein, a stump for coaction with said tumbler, means to be lockedby said tumbler, and an llO auxiliary latch for automatically clogging saidv tumbler when the auxiliary latch is projected.

5. In a lock, a lock case, a latch bolt, a slide bolt in said case, means carried by' said slide bolt for moving said latch bolt, means for moving said first mentioned means for retract-ing .said slide bolt. and an auxiliary latch for floggingsaid slide bolt to prevent actuation thereof except when the auxiliary latch is retracted.

G. In a lock. a lock case, a spring pressed latch bolt7 a slide bolt in said case and having a notch therein, a tumbler pivoted on said slide bolt and having` a projection in said notch, a stump in the casing and cooperating with said tumblerv for holding the sameand the slide bolt in both retracted and locked positions, an auxiliary latch for dogging said tumbler lwhen the latch is in ex- Minded position, lever mechanism ou said ,ailiiio ioi;` n, cyiii'iiic-i ioi'i-z im j :i loi bzifk 'for engaging said lovoi' mschzmism 'foi' reli'aoting die latch boit when the siide bolt is in the unlocked position, a second Cylinder look having a roll back for depressing the projection on the tumbler and moving the slide bolt to the locked position, and means on the slide boit :oi' locking; thc izz'hch ooit in locked posifioii, soia` icfei mechaiiiisiii Cziiified by the slide boit boing moved to :i pofsition so as to be out` of 'the path ofvmovoment of the roll backs on said Cylinder locks When the slide bolt is movcd'to locked po.Qi

tion.

NORMAN B. HURD 

